documentation updated

Merge pull request boostorg#106 from shawnanastasio/ppc64_elfv2_fix

Fix ABI violation on ppc64 ELFv2, fixes boostorg#72

abi::__forced_unwind is only part of gnu's libstc++

Merge pull request boostorg#98 from tux3/fix_ios_i386_jump

Fix jump_i386_sysv_macho writing garbage to the x87 control word

Reproducibility: Set .file section for all *_elf_gas.S

- in context of boostorg#91

Add a .file directive to all *_elf_gas.S files to prevent the linker
adding a host build-system path as a FILE symbol to the object file.
Without this, the gnu linker adds a symbol like this:

thanks to Douglas Royds <douglas.royds@taitradio.com>
openembedded/openembedded-core

Merge branch 'develop'

Merge branch 'develop'

Revert "fix name clash with forced_unwind"

This reverts commit 094f4ca.

Merge branch 'develop'

function executed by resume_with() has to return a continuation